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Table 1 Weight, SpO2 and StO2 during the exercise protocol at different altitude time points

From: Changes in skeletal muscle oxygenation during exercise measured by near-infrared spectroscopy on ascent to altitude

 

Altitude

 

Sea level

3,500 m

5,300 m-a

5,300 m-b

Number of subjects

18

16

16

16

Weight (kg)

79.1 (72.7 to 85.5)

78.1 (71.2 to 85.1)

78.3* (71.9 to 84.6)

73.3* (69.0 to 77.6)

Resting SpO2 (%)

97.7 (97.2 to 98.2)

88.5* (86.8 to 90.2)

81.8* (79.8 to 82.8)

84.3* (81.4 to 87.2)

Resting StO2 (%)

74.4 (68.6 to 80.1)

58.4* (53.0 to 63.7)

70.2 (62.3 to 78.0)

57.5* (49.8 to 65.1)

StO2 3-minute ULC(%)

81.1† (73.8 to 88.3)

65.5*† (58.2 to 72.8)

80.3† (73.3 to 87.4)

69.7*† (63.4 to 76.0)

StO2 VO2 max (%)

36.4† (28.5 to 44.3)

24.8† (19.9 to 29.7)

52.5*† (41.7 to 63.3)

21.9† (12.0 to 31.7)

StO2 60 seconds post-exercise (%)

82.3† (76.2 to 88.5)

64.3*† (59.4 to 69.2)

69.8† (63.4 to 76.2)

63.1*† (54.8 to 71.4)

  1. Data are presented as mean (95% confidence interval). SpO2, peripheral oxygen saturation; StO2, tissue oxygen saturation; ULC, unloaded cycling; VO2 max, maximal oxygen consumption. *Significantly different from sea level. †Significantly different from the previous exercise stage.
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